51
|
Bagul C, Rao GK, Makani VKK, Tamboli JR, Pal-Bhadra M, Kamal A. Synthesis and biological evaluation of chalcone-linked pyrazolo[1,5- a]pyrimidines as potential anticancer agents. MEDCHEMCOMM 2017; 8:1810-1816. [PMID: 30108891 DOI: 10.1039/c7md00193b] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/18/2017] [Accepted: 07/13/2017] [Indexed: 12/30/2022]
Abstract
A series of pyrazolo[1,5-a]pyrimidines substituted at C5 with 1-phenylprop-2-en-1-one (6a-q) and 3-phenylprop-2-en-1-one (7a-k) was synthesized and evaluated for antiproliferative activity. Among them, 6h was found to be the most active compound against the MDA-MB-231 cell line with an IC50 of 2.6 μM . The antiproliferative activity of this series of compounds ranged from 2.6 to 34.9 μM against A549 (lung cancer), MDA-MB-231 (breast cancer) and DU-145 (prostate cancer) cell lines. FACS analysis revealed that these hybrids arrest the cell cycle at the subG1 phase. Western blot analysis and an immunofluorescence assay showed the inhibition of the EGFR and STAT3 axis, which plays an important role in cell survival and apoptosis. Western blot and RT-PCR analyses that displayed an increase in apoptotic proteins such as p53, p21 and Bax and a decrease in the anti-apoptotic proteins Bcl-2 and procaspase-9 confirmed the ability of these hybrids to trigger cell death by apoptosis. Molecular docking studies described the binding of these hybrids to the ATP binding site of EGFR.
Collapse
Affiliation(s)
- Chandrakant Bagul
- Department of Medicinal Chemistry , National Institute of Pharmaceutical Education and Research (NIPER) , Hyderabad-500 037 , India
| | | | | | - Jaki R Tamboli
- Medicinal Chemistry & Pharmacology , CSIR-Indian Institute of Chemical Technology , Hyderabad 500 007 , India .
| | - Manika Pal-Bhadra
- Chemical Biology , CSIR-Indian Institute of Chemical Technology , Hyderabad 500 007 , India .
| | - Ahmed Kamal
- Department of Medicinal Chemistry , National Institute of Pharmaceutical Education and Research (NIPER) , Hyderabad-500 037 , India.,Medicinal Chemistry & Pharmacology , CSIR-Indian Institute of Chemical Technology , Hyderabad 500 007 , India .
| |
Collapse
|
52
|
Odhiambo OC, Wamakima HN, Magoma GN, Kirira PG, Malala BJ, Kimani FT, Muregi FW. Efficacy and safety evaluation of a novel trioxaquine in the management of cerebral malaria in a mouse model. Malar J 2017; 16:268. [PMID: 28673299 PMCID: PMC5496145 DOI: 10.1186/s12936-017-1917-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2016] [Accepted: 06/27/2017] [Indexed: 11/22/2022] Open
Abstract
Background The emergence of multidrug-resistant strains of Plasmodium falciparum poses a great threat of increased fatalities in cases of cerebral and other forms of severe malaria infections in which parenteral artesunate monotherapy is the current drug of choice. The study aimed to investigate in a mouse model of human cerebral malaria whether a trioxaquine chemically synthesized by covalent linking of a 4,7-dichloroquinoline pharmacophore to artesunate through a recent drug development approach termed ‘covalent bitherapy’ could improve the curative outcomes in cerebral malaria infections. Methods Human cerebral malaria rodent model, the C57BL/6 male mice were infected intraperitoneally (ip) with Plasmodium berghei ANKA and intravenously (iv) treated with the trioxaquine from day 8 post-infection (pi) at 12.5 and 25 mg/kg, respectively, twice a day for 3 days. Treatments with the trioxaquine precursors (artesunate and 4,7-dichloroquine), and quinine were also included as controls. In vivo safety evaluation for the trioxaquine was done according to Organization for Economic Co-operation and Development (OECD) guidelines 423, where female Swiss albino mice were orally administered with either 300 or 2000 mg/kg of the trioxaquine and monitored for signs of severity, and or mortality for 14 days post-treatment. Results The trioxaquine showed a potent and a rapid antiplasmodial activity with 80% parasite clearance in the first 24 h for the two dosages used. Long-term parasitaemia monitoring showed a total parasite clearance as the treated mice survived beyond 60 days post-treatment, with no recrudescence observed. Artesunate treated mice showed recrudescence 8 days post-treatment, with all mice in this group succumbing to the infection. Also, 4,7-dichloroquinoline and quinine did not show any significant parasitaemia suppression in the first 24 h post-treatment, with the animals succumbing to the infection. Conclusion Covalent bitherapy proves to be a viable source of urgently needed new anti-malarials for management of cerebral malaria, and this polypharmacology approach could be a potential strategy to protect artesunate from parasite resistance and in potentially improving clinical outcomes in severe forms of malaria infections.
Collapse
Affiliation(s)
- Onyango C Odhiambo
- Department of Biochemistry, Jomo Kenyatta University of Agriculture and Technology, P.O. Box 62000, Nairobi, Kenya
| | - Hannah N Wamakima
- Department of Pharmaceutical Sciences, Mount Kenya University, P.O. Box 342-01000, Thika, Kenya
| | - Gabriel N Magoma
- Department of Biochemistry, Jomo Kenyatta University of Agriculture and Technology, P.O. Box 62000, Nairobi, Kenya
| | - Peter G Kirira
- Department of Physical Sciences, Mount Kenya University, P.O. Box 342-01000, Thika, Kenya
| | - Bonface J Malala
- Department of Biological Sciences, Mount Kenya University, P.O. Box 342-01000, Thika, Kenya
| | - Francis T Kimani
- Centre for Biotechnology Research and Development, Kenya Medical Research Institute (KEMRI), P.O. Box 54840, Nairobi, Kenya
| | - Francis W Muregi
- Department of Biological Sciences, Mount Kenya University, P.O. Box 342-01000, Thika, Kenya.
| |
Collapse
|
53
|
Are Antimalarial Hybrid Molecules a Close Reality or a Distant Dream? Antimicrob Agents Chemother 2017; 61:AAC.00249-17. [PMID: 28289029 DOI: 10.1128/aac.00249-17] [Citation(s) in RCA: 43] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
Emergence of drug-resistant Plasmodium falciparum strains has led to a situation of haste in the scientific and pharmaceutical communities. Hence, all their efforts are redirected toward finding alternative chemotherapeutic agents that are capable of combating multidrug-resistant parasite strains. In light of this situation, scientists have come up with the concept of hybridization of two or more active pharmacophores into a single chemical entity, resulting in "antimalarial hybrids." The approach has been applied widely for generation of lead compounds against deadly diseases such as cancer and AIDS, with a proven potential for use as novel drugs, but is comparatively new in the sphere of antimalarial drug discovery. A sudden surge has been evidenced in the number of studies on the design and synthesis of hybrids for treating malaria and may be regarded as proof of their potential advantages over artemisinin-based combination therapy (ACT). However, it is evident from recent studies that most of the potential advantages of antimalarial hybrids, such as lower toxicity, better pharmacokinetics, and easier formulation, have yet to be realized. A number of questions left unaddressed at present need to be answered before this approach can progress to the late stages of clinical development and prove their worth in the clinic. To the best of our knowledge, this compilation is the first attempt to shed light on the shortcomings that are surfacing as more and more studies on molecular hybridization of the active pharmacophores of known antimalarials are being published.
Collapse
|
54
|
Anti-malarial effect of novel chloroquine derivatives as agents for the treatment of malaria. Malar J 2017; 16:80. [PMID: 28212631 PMCID: PMC5316213 DOI: 10.1186/s12936-017-1725-z] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2016] [Accepted: 02/06/2017] [Indexed: 11/10/2022] Open
Abstract
Background The widespread emergence of anti-malarial drug resistance has necessitated the discovery of novel anti-malarial drug candidates. In this study, chloroquine derivatives were evaluated for the improved anti-malarial activity. Results Novel two derivatives (SKM13 and SKM14) were synthesized based on the chloroquine (CQ) template containing modified side chains such as α,β-unsaturated amides and phenylmethyl group. The selective index indicated that SKM13 was 1.28-fold more effective than CQ against the CQ-resistant strain Plasmodium falciparum. An in vivo mouse study demonstrated that SKM13 (20 mg/kg) could completely inhibit Plasmodium berghei growth in blood and increased the survival rate from 40 to 100% at 12 days after infection. Haematological parameters [red blood cell (RBC) count, haemoglobin level, and haematocrit level] were observed as an indication of clinical malarial anaemia during an evaluation of the efficacy of SKM13 in a 4-day suppression test. An in vivo study showed a decrease of greater than 70% in the number of RBC in P. berghei-infected mice over 12 days, but the SKM13 (20 mg/kg)-treated group showed no loss of RBC. Conclusions CQ derivatives with substituents such as α,β-unsaturated amides and phenylmethyl group have enhanced anti-malarial activity against the CQ-resistant strain P. falciparum, and SKM13 is an excellent anti-malarial drug candidate in mice model. Electronic supplementary material The online version of this article (doi:10.1186/s12936-017-1725-z) contains supplementary material, which is available to authorized users.
Collapse
|
55
|
Rudrapal M, Chetia D. Endoperoxide antimalarials: development, structural diversity and pharmacodynamic aspects with reference to 1,2,4-trioxane-based structural scaffold. DRUG DESIGN DEVELOPMENT AND THERAPY 2016; 10:3575-3590. [PMID: 27843298 PMCID: PMC5098533 DOI: 10.2147/dddt.s118116] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Malaria disease continues to be a major health problem worldwide due to the emergence of multidrug-resistant strains of Plasmodium falciparum. In recent days, artemisinin (ART)-based drugs and combination therapies remain the drugs of choice for resistant P. falciparum malaria. However, resistance to ART-based drugs has begun to appear in some parts of the world. Endoperoxide compounds (natural/semisynthetic/synthetic) representing a huge number of antimalarial agents possess a wide structural diversity with a desired antimalarial effectiveness against resistant P. falciparum malaria. The 1,2,4-trioxane ring system lacking the lactone ring that constitutes the most important endoperoxide structural scaffold is believed to be the key pharmacophoric moiety and is primarily responsible for the pharmacodynamic potential of endoperoxide-based antimalarials. Due to this reason, research into endoperoxide, particularly 1,2,4-trioxane-, 1,2,4-trioxolane- and 1,2,4,5-teraoxane-based scaffolds, has gained significant interest in recent years for developing antimalarial drugs against resistant malaria. In this paper, a comprehensive effort has been made to review the development of endoperoxide antimalarials from traditional antimalarial leads (natural/semisynthetic) and structural diversity of endoperoxide molecules derived from 1,2,4-trioxane-, 1,2,4-trioxolane- and 1,2,4,5-teraoxane-based structural scaffolds, including their chimeric (hybrid) molecules, which are newer and potent antimalarial agents.
Collapse
Affiliation(s)
- Mithun Rudrapal
- Department of Pharmaceutical Sciences, Dibrugarh University, Dibrugarh, India
| | - Dipak Chetia
- Department of Pharmaceutical Sciences, Dibrugarh University, Dibrugarh, India
| |
Collapse
|
56
|
Dana S, Keshri SK, Shukla J, Vikramdeo KS, Mondal N, Mukhopadhyay P, Dhar SK. Design, Synthesis and Evaluation of Bifunctional Acridinine-Naphthalenediimide Redox-Active Conjugates as Antimalarials. ACS OMEGA 2016; 1:318-333. [PMID: 30023479 PMCID: PMC6044610 DOI: 10.1021/acsomega.6b00060] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/28/2016] [Accepted: 06/30/2016] [Indexed: 06/08/2023]
Abstract
A novel class of bifunctional molecules was synthesized integrating acridine (Ac) and redox-active naphthalenediimide (NDI) scaffolds directly and through a flexible linker (en). We evaluated in vitro antiplasmodial activity, physicochemical properties, and a possible mode of action. Theoretical studies suggested electronic segmentation between the electron-rich Ac and electron-deficient NDI scaffolds. Orthogonal Ac-NDI molecules showed activities in the micromolar to submicromolar range against a chloroquine (CQ)-sensitive strain of human malaria pathogen Plasmodium falciparum (maximum activity, IC50: 0.419 μM). The flexible Ac-en-NDI molecules were most potent and showed activity in the nanomolar range against both CQ-sensitive (with most effective compounds, IC50: 3.65 and 4.33 nM) as well as CQ-resistant (with most effective compounds, IC50: 52.20 and 28.53 nM) strains of P. falciparum. Significantly, with CQ-resistant strains, the activity of the most effective compounds was 1 order of magnitude better than that of standard drug CQ. Ac-en-NDI-conjugated molecules were significantly more potent than the individual NDI and Ac-based molecules. The structure-activity relationship (SAR) suggests that the flexible spacer (en) linking the Ac and NDI scaffolds plays a vital role in exhibiting improved potency. None of the molecules triggered hemolysis in culture, and the most potent compounds did not show cytotoxicity in vitro against mammalian fibroblast NIH3T3 cells at their respective IC50 values. The other significant outcome of this work is that some of the investigated molecules have the potential to affect multiple processes in the parasite including the hemozoin formation in digestive vacuoles (DVs), mitochondrial membrane potential, and the redox homeostasis of the parasite.
Collapse
Affiliation(s)
- Srikanta Dana
- Supramolecular
and Material Chemistry Lab, School of Physical Sciences, Jawaharlal Nehru University, New Mehrauli Road, 110067 New Delhi, India
- Special
Centre for Molecular Medicine, Jawaharlal
Nehru University, New
Mehrauli Road, 110067 New Delhi, India
| | - Sudhir Kumar Keshri
- Supramolecular
and Material Chemistry Lab, School of Physical Sciences, Jawaharlal Nehru University, New Mehrauli Road, 110067 New Delhi, India
| | - Jyoti Shukla
- Supramolecular
and Material Chemistry Lab, School of Physical Sciences, Jawaharlal Nehru University, New Mehrauli Road, 110067 New Delhi, India
| | - Kunwar Somesh Vikramdeo
- School
of Life Sciences, Jawaharlal Nehru University, New Mehrauli Road, 110067 New Delhi, India
| | - Neelima Mondal
- School
of Life Sciences, Jawaharlal Nehru University, New Mehrauli Road, 110067 New Delhi, India
| | - Pritam Mukhopadhyay
- Supramolecular
and Material Chemistry Lab, School of Physical Sciences, Jawaharlal Nehru University, New Mehrauli Road, 110067 New Delhi, India
| | - Suman Kumar Dhar
- Special
Centre for Molecular Medicine, Jawaharlal
Nehru University, New
Mehrauli Road, 110067 New Delhi, India
| |
Collapse
|
57
|
Yaremenko IA, Vil’ VA, Demchuk DV, Terent’ev AO. Rearrangements of organic peroxides and related processes. Beilstein J Org Chem 2016; 12:1647-748. [PMID: 27559418 PMCID: PMC4979652 DOI: 10.3762/bjoc.12.162] [Citation(s) in RCA: 128] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2016] [Accepted: 07/14/2016] [Indexed: 12/17/2022] Open
Abstract
This review is the first to collate and summarize main data on named and unnamed rearrangement reactions of peroxides. It should be noted, that in the chemistry of peroxides two types of processes are considered under the term rearrangements. These are conventional rearrangements occurring with the retention of the molecular weight and transformations of one of the peroxide moieties after O-O-bond cleavage. Detailed information about the Baeyer-Villiger, Criegee, Hock, Kornblum-DeLaMare, Dakin, Elbs, Schenck, Smith, Wieland, and Story reactions is given. Unnamed rearrangements of organic peroxides and related processes are also analyzed. The rearrangements and related processes of important natural and synthetic peroxides are discussed separately.
Collapse
Affiliation(s)
- Ivan A Yaremenko
- N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Leninsky Prospect 47, Moscow, 119991, Russia
| | - Vera A Vil’
- N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Leninsky Prospect 47, Moscow, 119991, Russia
| | - Dmitry V Demchuk
- N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Leninsky Prospect 47, Moscow, 119991, Russia
| | - Alexander O Terent’ev
- N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Leninsky Prospect 47, Moscow, 119991, Russia
| |
Collapse
|
58
|
Rad MNS, Behrouz S, Behrouz M, Sami A, Mardkhoshnood M, Zarenezhad A, Zarenezhad E. Design, synthesis and biological evaluation of novel 1,2,3-triazolyl $$\upbeta $$ β -hydroxy alkyl/carbazole hybrid molecules. Mol Divers 2016; 20:705-18. [DOI: 10.1007/s11030-016-9678-7] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2015] [Accepted: 05/22/2016] [Indexed: 12/14/2022]
|
59
|
Arzumanyan AV, Terent’ev AO, Novikov RA, Lakhtin VG, Grigoriev MS, Nikishin GI. Reduction of Organosilicon Peroxides: Ring Contraction and Cyclodimerization. Organometallics 2016. [DOI: 10.1021/acs.organomet.6b00129] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Ashot V. Arzumanyan
- N.D.
Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, 47 Leninsky prosp., 119991 Moscow, Russian Federation
- A.
N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, 28 Vavilova ul, Moscow 119991, Russian Federation
| | - Alexander O. Terent’ev
- N.D.
Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, 47 Leninsky prosp., 119991 Moscow, Russian Federation
| | - Roman A. Novikov
- N.D.
Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, 47 Leninsky prosp., 119991 Moscow, Russian Federation
| | - Valentin G. Lakhtin
- State Scientific Research Institute of Chemistry and Technology of Organoelement Compounds, 38 Shosse
Entuziastov, 111123 Moscow, Russian Federation
| | - Michail S. Grigoriev
- A.
N. Frumkin Institute of Physical Chemistry and Electrochemistry, Radiochemistry
Department, Russian Academy of Sciences, 40 Obruchev st., 117342 Moscow, Russian Federation
| | - Gennady I. Nikishin
- N.D.
Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, 47 Leninsky prosp., 119991 Moscow, Russian Federation
| |
Collapse
|
60
|
Makgatho M, Maimela E, Mbajiorgu F. Ketolide agents HMR 3004 and HMR 3647 (telithromycin) inhibit the growth of Plasmodium falciparum in vitro. Afr Health Sci 2015; 15:1271-6. [PMID: 26958030 DOI: 10.4314/ahs.v15i4.28] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
BACKGROUND Malaria is on the increase due to emergence of parasite drug resistance and there is thus an urgent need for the development of new antiparasitic drugs effective at low concentrations. Ketolides antibiotics are used for treatment of various ailments and are relevant candidates to establish antiparasitic activity. OBJECTIVES The present study investigates the activity of ketolide compounds HMR 3004 and HMR 3647 (telithromycin) (0.025-12.5 µM) for activity against chloroquine-sensitive and resistant strains of Plasmodium falciparum in vitro. METHODS The antiplasmodial activity of the two ketolide agents were determined using microscopic and colorimetric [lactate dehydrogenase assay] procedures. RESULTS Both HMR 3004 and HMR 3647 caused a dose-dependent inhibition of growth of both parasite strains with IC50 values 3 and 15 nM, respectively. Suppression of parasite growth was evident after 8 hours of exposure to both agents at 12.5 µM with total parasite clearance achieved at 40 hours. CONCLUSION The results indicate lack of cross-resistance between the ketolide compounds and chloroquine, implying presence of a drug target different from that of chloroquine. The particular drug target has still to be investigated but the stage-specific results indicate that it is expressed in all parasite growth phases. These observations demonstrate the anti-malarial potential of the ketolide antimicrobial agents.
Collapse
|
61
|
Screening of potential targets in Plasmodium falciparum using stage-specific metabolic network analysis. Mol Divers 2015; 19:991-1002. [PMID: 26303382 DOI: 10.1007/s11030-015-9632-0] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2015] [Accepted: 08/12/2015] [Indexed: 01/29/2023]
Abstract
The Apicomplexa parasite Plasmodium is a major cause of death in developing countries which are less equipped to bring new medicines to the market. Currently available drugs used for treatment of malaria are limited either by inadequate efficacy, toxicity and/or increased resistance. Availability of the genome sequence, microarray data and metabolic profile of Plasmodium parasite offers an opportunity for the identification of stage-specific genes important to the organism's lifecycle. In this study, microarray data were analysed for differential expression and overlapped onto metabolic pathways to identify differentially regulated pathways essential for transition to successive erythrocytic stages. The results obtained indicate that S-adenosylmethionine decarboxylase/ornithine decarboxylase, a bifunctional enzyme required for polyamine synthesis, is important for the Plasmodium cell growth in the absence of exogenous polyamines. S-adenosylmethionine decarboxylase/ornithine decarboxylase is a valuable target for designing therapeutically useful inhibitors. One such inhibitor, [Formula: see text]-difluoromethyl ornithine, is currently in use for the treatment of African sleeping sickness caused by Trypanosoma brucei. Structural studies of ornithine decarboxylase along with known inhibitors and their analogues were carried out to screen drug databases for more effective and less toxic compounds.
Collapse
|
62
|
Teiten MH, Dicato M, Diederich M. Hybrid curcumin compounds: a new strategy for cancer treatment. Molecules 2014; 19:20839-63. [PMID: 25514225 PMCID: PMC6271749 DOI: 10.3390/molecules191220839] [Citation(s) in RCA: 78] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2014] [Revised: 11/26/2014] [Accepted: 11/27/2014] [Indexed: 01/09/2023] Open
Abstract
Cancer is a multifactorial disease that requires treatments able to target multiple intracellular components and signaling pathways. The natural compound, curcumin, was already described as a promising anticancer agent due to its multipotent properties and huge amount of molecular targets in vitro. Its translation to the clinic is, however, limited by its reduced solubility and bioavailability in patients. In order to overcome these pharmacokinetic deficits of curcumin, several strategies, such as the design of synthetic analogs, the combination with specific adjuvants or nano-formulations, have been developed. By taking into account the risk-benefit profile of drug combinations, as well as the knowledge about curcumin's structure-activity relationship, a new concept for the combination of curcumin with scaffolds from different natural products or components has emerged. The concept of a hybrid curcumin molecule is based on the incorporation or combination of curcumin with specific antibodies, adjuvants or other natural products already used or not in conventional chemotherapy, in one single molecule. The high diversity of such conjugations enhances the selectivity and inherent biological activities and properties, as well as the efficacy of the parental compound, with particular emphasis on improving the efficacy of curcumin for future clinical treatments.
Collapse
Affiliation(s)
- Marie-Hélène Teiten
- Laboratory of Molecular and Cellular Biology of Cancer (LBMCC), Hôpital Kirchberg, 9, Rue Edward Steichen, Luxembourg L-2540, Luxembourg.
| | - Mario Dicato
- Laboratory of Molecular and Cellular Biology of Cancer (LBMCC), Hôpital Kirchberg, 9, Rue Edward Steichen, Luxembourg L-2540, Luxembourg.
| | - Marc Diederich
- Department of Pharmacy, College of Pharmacy, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 151-742, Korea.
| |
Collapse
|
63
|
Raj R, Sharma V, Hopper MJ, Patel N, Hall D, Wrischnik LA, Land KM, Kumar V. Synthesis and preliminary in vitro activity of mono- and bis-1 H-1,2,3-triazole-tethered β-lactam-isatin conjugates against the human protozoal pathogen Trichomonas vaginalis. Med Chem Res 2014; 23:3671-3680. [PMID: 32214766 PMCID: PMC7080013 DOI: 10.1007/s00044-014-0956-6] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2013] [Accepted: 02/12/2014] [Indexed: 02/03/2023]
Abstract
In this study, we describe the synthesis of mono- and bis-1H-1,2,3-triazole-tethered β-lactam-isatin conjugates using copper-catalysed azide-alkyne cycloaddition reaction between mono- and di-propargylated azetidin-2-ones and N-alkylazido isatins. The synthesized conjugates were evaluated for their preliminary in vitro analysis against Trichomonas vaginalis at 50 μM. The efficacy of synthesized hybrids was observed to depend on the substituent at N-1 position of β-lactam ring, as well as the presence of single/double 1H-1,2,3-triazole linker. Among the synthesized conjugates, the presence of a p-tolyl substituent at N-1 of β-lactam ring was preferred for good activity profiles while the increase in spacer length did not influence the efficacy of the compounds. Compounds with high levels of potency were further analysed to determine their IC50 values, as well as cytotoxicity profiles against mammalian cells. The most active compound in the synthesized conjugates displayed an IC50 value of 10.49 μM against cultured G3 strain of T. vaginalis and was non-toxic to cultured mammalian HeLa cells at the same concentration.
Collapse
Affiliation(s)
- Raghu Raj
- Department of Chemistry, Guru Nanak Dev University, Amritsar, 143005 Punjab India
| | - Vaishali Sharma
- Department of Chemistry, Guru Nanak Dev University, Amritsar, 143005 Punjab India
| | - Melissa J. Hopper
- Department of Biological Sciences, University of the Pacific, Stockton, CA 95211 USA
| | - Neal Patel
- Department of Biological Sciences, University of the Pacific, Stockton, CA 95211 USA
| | - Dominique Hall
- Department of Biological Sciences, University of the Pacific, Stockton, CA 95211 USA
| | - Lisa A. Wrischnik
- Department of Biological Sciences, University of the Pacific, Stockton, CA 95211 USA
| | - Kirkwood M. Land
- Department of Biological Sciences, University of the Pacific, Stockton, CA 95211 USA
| | - Vipan Kumar
- Department of Chemistry, Guru Nanak Dev University, Amritsar, 143005 Punjab India
| |
Collapse
|
64
|
Abstract
Malaria elimination has recently been reinstated as a global health priority but current therapies seem to be insufficient for the task. Elimination efforts require new drug classes that alleviate symptoms, prevent transmission and provide a radical cure. To develop these next-generation medicines, public-private partnerships are funding innovative approaches to identify compounds that target multiple parasite species at multiple stages of the parasite life cycle. In this Review, we discuss the cell-, chemistry- and target-based approaches used to discover new drug candidates that are currently in clinical trials or undergoing preclinical testing.
Collapse
|
65
|
Theoduloz C, Bravo I, Pertino MW, Schmeda-Hirschmann G. Diterpenylquinone hybrids: synthesis and assessment of gastroprotective mechanisms of action in human cells. Molecules 2013; 18:11044-66. [PMID: 24025455 PMCID: PMC6270338 DOI: 10.3390/molecules180911044] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2013] [Revised: 08/23/2013] [Accepted: 09/03/2013] [Indexed: 11/16/2022] Open
Abstract
A modern approach in the search for new bioactive molecules is the synthesis of novel chemical entities combining molecules of different biosynthetic origin presenting biological effects as single compounds. Gastroprotective compounds from South American medicinal plants, namely quinones and diterpenes, were used as building blocks to obtain hybrid diterpenylquinones. Starting from the labdane diterpene junicedric acid and two isomers, as well as from three quinones, including lapachol, 18 hybrid molecules were synthesized. Six of them are described for the first time. The potential gastroprotective mechanisms of action of the compounds were assessed in dose-response experiments using human gastric epithelial cells (AGS) and human lung fibroblasts (MRC-5). The following studies were carried out: stimulation of cell proliferation, cytoprotection against sodium taurocholate (NaT)-induced damage, synthesis of PGE2 and total reduced sulfhydryl (GSH) content. The antioxidant capacity of the compounds was determined on the inhibition of the lipoperoxidation in human erythrocyte membranes. Hybrid compounds presented activities different from those shown by the starting compounds, supporting the potential of this approach in the search for new bioactive molecules. The effects might be modulated by selective modification in the terpene or quinone moieties of the new molecules. Structure-activity relationships are discussed.
Collapse
Affiliation(s)
- Cristina Theoduloz
- Laboratorio de Cultivo Celular, Facultad de Ciencias de la Salud, Universidad de Talca, Casilla 747, 3460000 Talca, Chile
- Author to whom correspondence should be addressed; E-Mail: ; Tel.: +56-71-2200-262; Fax: +56-71-2201-573
| | - Ivanna Bravo
- Laboratorio de Química de Productos Naturales, Instituto de Química de Recursos Naturales, Universidad de Talca, Casilla 747, 3460000 Talca, Chile; E-Mails: (I.B.); (M.W.P.); (G.S.-H.)
| | - Mariano Walter Pertino
- Laboratorio de Química de Productos Naturales, Instituto de Química de Recursos Naturales, Universidad de Talca, Casilla 747, 3460000 Talca, Chile; E-Mails: (I.B.); (M.W.P.); (G.S.-H.)
| | - Guillermo Schmeda-Hirschmann
- Laboratorio de Química de Productos Naturales, Instituto de Química de Recursos Naturales, Universidad de Talca, Casilla 747, 3460000 Talca, Chile; E-Mails: (I.B.); (M.W.P.); (G.S.-H.)
| |
Collapse
|
66
|
Singh K, Kaur H, Chibale K, Balzarini J. Synthesis of 4-aminoquinoline-pyrimidine hybrids as potent antimalarials and their mode of action studies. Eur J Med Chem 2013; 66:314-23. [PMID: 23811093 PMCID: PMC7115683 DOI: 10.1016/j.ejmech.2013.05.046] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2013] [Revised: 05/29/2013] [Accepted: 05/30/2013] [Indexed: 11/23/2022]
Abstract
One of the most viable options to tackle the growing resistance to the antimalarial drugs such as artemisinin is to resort to synthetic drugs. The multi-target strategy involving the use of hybrid drugs has shown promise. In line with this, new hybrids of quinoline with pyrimidine have been synthesized and evaluated for their antiplasmodial activity against both CQ(S) and CQ(R) strains of Plasmodium falciparum. These depicted activity in nanomolar range and were found to bind to heme as well as AT rich pUC18 DNA.
Collapse
Affiliation(s)
- Kamaljit Singh
- Department of Chemistry, UGC-Centre of Advance Study-1, Guru Nanak Dev University, Amritsar, Punjab 143005, India.
| | | | | | | |
Collapse
|
67
|
Njogu PM, Gut J, Rosenthal PJ, Chibale K. Design, Synthesis, and Antiplasmodial Activity of Hybrid Compounds Based on (2R,3S)-N-Benzoyl-3-phenylisoserine. ACS Med Chem Lett 2013; 4:637-41. [PMID: 24900723 DOI: 10.1021/ml400164t] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2013] [Accepted: 05/22/2013] [Indexed: 11/28/2022] Open
Abstract
A series of hybrid compounds based on (2R,3S)-N-benzoyl-3-phenylisoserine, artemisinin, and quinoline moieties was synthesized and tested for in vitro antiplasmodial activity against erythrocytic stages of K1 and W2 strains of Plasmodium falciparum. Two hybrid compounds incorporating (2R,3S)-N-benzoyl-3-phenylisoserine and artemisinin scaffolds were 3- to 4-fold more active than dihydroartemisinin, with nanomolar IC50 values against Plasmodium falciparum K1 strain.
Collapse
Affiliation(s)
- Peter M. Njogu
- Department of Chemistry, University of Cape Town, Rondebosch 7701, South Africa
| | - Jiri Gut
- Department of Medicine, San
Francisco General Hospital, University of California, San Francisco, California 94143, United States
| | - Philip J. Rosenthal
- Department of Medicine, San
Francisco General Hospital, University of California, San Francisco, California 94143, United States
| | - Kelly Chibale
- Department of Chemistry, University of Cape Town, Rondebosch 7701, South Africa
- Institute of Infectious Disease
and Molecular Medicine, University of Cape Town, Rondebosch 7701, South Africa
| |
Collapse
|
68
|
Pan SY, Zhou SF, Gao SH, Yu ZL, Zhang SF, Tang MK, Sun JN, Ma DL, Han YF, Fong WF, Ko KM. New Perspectives on How to Discover Drugs from Herbal Medicines: CAM's Outstanding Contribution to Modern Therapeutics. EVIDENCE-BASED COMPLEMENTARY AND ALTERNATIVE MEDICINE : ECAM 2013; 2013:627375. [PMID: 23634172 PMCID: PMC3619623 DOI: 10.1155/2013/627375] [Citation(s) in RCA: 241] [Impact Index Per Article: 21.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/16/2012] [Accepted: 01/29/2013] [Indexed: 01/19/2023]
Abstract
With tens of thousands of plant species on earth, we are endowed with an enormous wealth of medicinal remedies from Mother Nature. Natural products and their derivatives represent more than 50% of all the drugs in modern therapeutics. Because of the low success rate and huge capital investment need, the research and development of conventional drugs are very costly and difficult. Over the past few decades, researchers have focused on drug discovery from herbal medicines or botanical sources, an important group of complementary and alternative medicine (CAM) therapy. With a long history of herbal usage for the clinical management of a variety of diseases in indigenous cultures, the success rate of developing a new drug from herbal medicinal preparations should, in theory, be higher than that from chemical synthesis. While the endeavor for drug discovery from herbal medicines is "experience driven," the search for a therapeutically useful synthetic drug, like "looking for a needle in a haystack," is a daunting task. In this paper, we first illustrated various approaches of drug discovery from herbal medicines. Typical examples of successful drug discovery from botanical sources were given. In addition, problems in drug discovery from herbal medicines were described and possible solutions were proposed. The prospect of drug discovery from herbal medicines in the postgenomic era was made with the provision of future directions in this area of drug development.
Collapse
Affiliation(s)
- Si-Yuan Pan
- School of Chinese Medicine, Beijing University of Chinese Medicine, Beijing 100102, China
| | - Shu-Feng Zhou
- College of Pharmacy,University of South Florida, Tampa, FL 33612, USA
| | - Si-Hua Gao
- School of basic medicine, Beijing University of Chinese Medicine, Beijing 100102, China
| | - Zhi-Ling Yu
- School of Chinese Medicine, Hong Kong Baptist University, Hong Kong
| | - Shuo-Feng Zhang
- School of Chinese Medicine, Beijing University of Chinese Medicine, Beijing 100102, China
| | - Min-Ke Tang
- School of Chinese Medicine, Beijing University of Chinese Medicine, Beijing 100102, China
| | - Jian-Ning Sun
- School of Chinese Medicine, Beijing University of Chinese Medicine, Beijing 100102, China
| | - Dik-Lung Ma
- Department of Chemistry, Hong Kong Baptist University, Hong Kong
| | - Yi-Fan Han
- Department of Applied Biology & Chemical Technology, Hong Kong Polytechnic University, Hong Kong
| | - Wang-Fun Fong
- School of Chinese Medicine, Hong Kong Baptist University, Hong Kong
| | - Kam-Ming Ko
- Division of Life Science, Hong Kong University of Science & Technology, Hong Kong
| |
Collapse
|
69
|
Bruno M, Trucchi B, Monti D, Romeo S, Kaiser M, Verotta L. Synthesis of a potent antimalarial agent through natural products conjugation. ChemMedChem 2013; 8:221-5. [PMID: 23307699 PMCID: PMC3836189 DOI: 10.1002/cmdc.201200503] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2012] [Indexed: 11/07/2022]
Abstract
Au naturel! (+)-Usnic acid (green) is a weak antimalarial agent, however, in conjugation with known antimalarial scaffolds and drugs, such as dihydroartemisinin (blue), potent activity against the blood-stage parasite can be seen both in vitro and in vivo. The compound shown exhibits an IC(50) value of 1.4 nM against Plasmodium falciparum in vitro and proved nearly as efficacious as artesunate in a mouse model of infection.
Collapse
Affiliation(s)
- Michela Bruno
- Dipartimento di Chimica, Università degli Studi di Milano, Via C. Golgi 19, 20133, Milano (Italy)
| | - Beatrice Trucchi
- Dipartimento di Chimica, Università degli Studi di Milano, Via C. Golgi 19, 20133, Milano (Italy)
| | - Diego Monti
- Istituto di Scienze e Tecnologie Molecolari, CNR, Via C. Golgi 19, 20133, Milano (Italy)
| | - Sergio Romeo
- Dipartimento di Scienze Farmaceutiche, Università degli Studi di Milano, Via L. Mangiagalli 25, 20133, Milano (Italy)
| | - Marcel Kaiser
- Department of Medical Parasitology & Infection Biology, Swiss, Tropical and Public Health Institute, Socinstrasse 57, 4002 Basel (Switzerland)
- University of Basel, Petersplatz 1, 4003 Basel (Switzerland)
| | - Luisella Verotta
- Dipartimento di Chimica, Università degli Studi di Milano, Via C. Golgi 19, 20133, Milano (Italy)
| |
Collapse
|
70
|
Rana S, Natarajan A. Face selective reduction of the exocyclic double bond in isatin derived spirocyclic lactones. Org Biomol Chem 2013; 11:244-7. [PMID: 23160888 PMCID: PMC3535013 DOI: 10.1039/c2ob27008k] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We report an unusual face selective reduction of the exocyclic double bond in the α-methylene-γ-butyrolactone motif of spiro-oxindole systems. The spiro-oxindoles were assembled by an indium metal mediated Barbier-type reaction followed by an acid catalyzed lactonization.
Collapse
Affiliation(s)
- Sandeep Rana
- Eppley Institute for Research in Cancer and Allied Diseases, University of Nebraska Medical Center, Omaha, NE, USA
| | - Amarnath Natarajan
- Eppley Institute for Research in Cancer and Allied Diseases, University of Nebraska Medical Center, Omaha, NE, USA
- Department of Chemistry, University of Nebraska, Lincoln, NE, USA
| |
Collapse
|
71
|
Mahapatra RK, Behera N, Naik PK. Molecular modeling and prediction of binding mode and relative binding affinity of Art-Qui-OH with P. falciparum Histo-Aspartic Protease (HAP). Bioinformation 2012; 8:827-33. [PMID: 23139593 PMCID: PMC3488846 DOI: 10.6026/97320630008827] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2012] [Accepted: 08/20/2012] [Indexed: 11/23/2022] Open
Abstract
The relative binding affinity in terms of ΔΔG (bind-cald) value of the antimalarial compound artemisinin-quinine hybrid is primarily derived and is discussed in this article with reference to the ΔG (bind-cald) values of two known inhibitors Pepstatin-A and KNI-10006 complexed with HAP enzyme. The ΔG (bind-cald) value for KNI-10006 and Pepstatin-A is -14.10 kcal/mol and -13.09 kcal/mol respectively. The MM-GB/SA scoring results in the relative binding energy (ΔΔG (bind-cald)) of the hybrid molecule with respect to Pepstatin-A as 2.43 kcal/mol and 3.44 kcal/mol against KNI-10006. The overall binding mode of Art-Qui-OH resembles that of Pepstatin-A binding in HAP active site. We suggest here that the ΔΔG (bind-cald) value & proposed binding mode of the Art-Qui-OH for HAP enzyme should be considered for further structure-based drug design effort.
Collapse
Affiliation(s)
- Rajani Kanta Mahapatra
- School of Life Sciences, Sambalpur University, Burla, Odisha-768019, India
- School of Biotechnology, KIIT University, Bhubaneswar, Odisha-751024, India
| | - Niranjan Behera
- School of Life Sciences, Sambalpur University, Burla, Odisha-768019, India
| | - Pradeep Kumar Naik
- Department of Biotechnology / Bioinformatics, JUIT, Solan, Himachal Pradesh-173 215, India
| |
Collapse
|
72
|
Mahapatra RK, Behera N, Naik PK. Molecular modeling and evaluation of binding mode and affinity of artemisinin-quinine hybrid and its congeners with Fe-protoporphyrin-IX as a putative receptor. Bioinformation 2012; 8:369-80. [PMID: 22570518 PMCID: PMC3346024 DOI: 10.6026/97320630008369] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2012] [Accepted: 04/16/2012] [Indexed: 11/23/2022] Open
Abstract
A recent rational approach to anti-malarial drug design is characterized as "covalent biotherapy" involves linking of two molecules with individual intrinsic activity into a single agent, thus packaging dual activity into a single hybrid molecule. In view of this background and reported anti malaria synergism between artemisinin and quinine; we describe the computer-assisted docking to predict molecular interaction and binding affinity of Artemisinin-Quinine hybrid and its derivatives with the intraparasitic haeme group of human haemoglobin. Starting from a crystallographic structure of Fe-protoporphyrin-IX, binding modes, orientation of peroxide bridge (Fe-O distance), docking score and interaction energy are predicted using the docking molecular mechanics based on generalized Born/surface area (MM-GBSA) solvation model. Seven new ligands were identified with a favourable glide score (XP score) and binding free energy (ΔG) with reference to the experimental structure from a data set of thirty four hybrid derivatives. The result shows the conformational property of the drug-receptor interaction and may lead to rational design and synthesis of improved potent artemisinin based hybrid antimalarial that target haemozoin formation.
Collapse
Affiliation(s)
- Rajani Kanta Mahapatra
- School of Life Sciences, Sambalpur University, Burla, Odisha-768019, India; School of Biotechnology, KIIT University, Bhubaneswar, Odisha-751024, India.
| | | | | |
Collapse
|
73
|
Pertino MW, Theoduloz C, Palenzuela JA, del Mar Afonso M, Yesilada E, Monsalve F, González P, Droguett D, Schmeda-Hirschmann G. Synthesis and pharmacological activity of diterpenylnaphthoquinone derivatives. Molecules 2011; 16:8614-28. [PMID: 21996716 PMCID: PMC6264310 DOI: 10.3390/molecules16108614] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2011] [Revised: 09/29/2011] [Accepted: 09/30/2011] [Indexed: 11/16/2022] Open
Abstract
New diterpenylquinones, combining a diterpene diacid and a naphthoquinone, were prepared from junicedric acid and lapachol. The new derivatives were assessed as gastroprotective agents by the HCl-EtOH-induced gastric lesions model in mice as well as for basal cytotoxicity on the following human cell lines: Normal lung fibroblasts (MRC-5), gastric epithelial adenocarcinoma (AGS), and hepatocellular carcinoma (Hep G2). Several of the new compounds were significantly active as antiulcer agents and showed selective cytotoxicity against AGS cells.
Collapse
Affiliation(s)
- Mariano Walter Pertino
- Instituto de Química de Recursos Naturales, Universidad de Talca, Casilla 747, Talca, Chile
| | - Cristina Theoduloz
- Facultad de Ciencias de la Salud, Universidad de Talca, Casilla 747, Talca, Chile
| | - Jose Antonio Palenzuela
- Instituto Universitario de Bio-Orgánica Antonio Gonzalez G., Universidad de La Laguna, Tenerife 38206, Spain
| | - Maria del Mar Afonso
- Instituto Universitario de Bio-Orgánica Antonio Gonzalez G., Universidad de La Laguna, Tenerife 38206, Spain
| | - Erdem Yesilada
- Faculty of Pharmacy, Yeditepe University, Istanbul 34755, Turkey
| | - Francisco Monsalve
- Facultad de Ciencias de la Salud, Universidad de Talca, Casilla 747, Talca, Chile
| | - Paulo González
- Facultad de Ciencias de la Salud, Universidad de Talca, Casilla 747, Talca, Chile
| | - Daniel Droguett
- Facultad de Ciencias de la Salud, Universidad de Talca, Casilla 747, Talca, Chile
| | - Guillermo Schmeda-Hirschmann
- Instituto de Química de Recursos Naturales, Universidad de Talca, Casilla 747, Talca, Chile
- Author to whom correspondence should be addressed; ; Tel.: +56-71-200288; Fax: + 56-71-201573
| |
Collapse
|
74
|
Baumeister S, Wiesner J, Reichenberg A, Hintz M, Bietz S, Harb OS, Roos DS, Kordes M, Friesen J, Matuschewski K, Lingelbach K, Jomaa H, Seeber F. Fosmidomycin uptake into Plasmodium and Babesia-infected erythrocytes is facilitated by parasite-induced new permeability pathways. PLoS One 2011; 6:e19334. [PMID: 21573242 PMCID: PMC3087763 DOI: 10.1371/journal.pone.0019334] [Citation(s) in RCA: 65] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2011] [Accepted: 03/27/2011] [Indexed: 11/18/2022] Open
Abstract
Background Highly charged compounds typically suffer from low membrane permeability and thus are generally regarded as sub-optimal drug candidates. Nonetheless, the highly charged drug fosmidomycin and its more active methyl-derivative FR900098 have proven parasiticidal activity against erythrocytic stages of the malaria parasite Plasmodium falciparum. Both compounds target the isoprenoid biosynthesis pathway present in bacteria and plastid-bearing organisms, like apicomplexan parasites. Surprisingly, the compounds are inactive against a range of apicomplexans replicating in nucleated cells, including Toxoplasma gondii. Methodology/Principal Findings Since non-infected erythrocytes are impermeable for FR90098, we hypothesized that these drugs are taken up only by erythrocytes infected with Plasmodium. We provide evidence that radiolabeled FR900098 accumulates in theses cells as a consequence of parasite-induced new properties of the host cell, which coincide with an increased permeability of the erythrocyte membrane. Babesia divergens, a related parasite that also infects human erythrocytes and is also known to induce an increase in membrane permeability, displays a similar susceptibility and uptake behavior with regard to the drug. In contrast, Toxoplasma gondii-infected cells do apparently not take up the compounds, and the drugs are inactive against the liver stages of Plasmodium berghei, a mouse malaria parasite. Conclusions/Significance Our findings provide an explanation for the observed differences in activity of fosmidomycin and FR900098 against different Apicomplexa. These results have important implications for future screens aimed at finding new and safe molecular entities active against P. falciparum and related parasites. Our data provide further evidence that parasite-induced new permeability pathways may be exploited as routes for drug delivery.
Collapse
Affiliation(s)
- Stefan Baumeister
- Parasitologie, Fachbereich Biologie, Philipps-Universität, Marburg, Germany
| | - Jochen Wiesner
- Institut für Klinische Immunologie und Transfusionsmedizin, Universitätsklinikum Giessen und Marburg GmbH, Giessen, Germany
| | - Armin Reichenberg
- Institut für Klinische Immunologie und Transfusionsmedizin, Universitätsklinikum Giessen und Marburg GmbH, Giessen, Germany
| | - Martin Hintz
- Institut für Klinische Immunologie und Transfusionsmedizin, Universitätsklinikum Giessen und Marburg GmbH, Giessen, Germany
| | - Sven Bietz
- Parasitologie, Fachbereich Biologie, Philipps-Universität, Marburg, Germany
| | - Omar S. Harb
- Department of Biology, University of Pennsylvania, Philadelphia, Pennsylvania, United States of America
| | - David S. Roos
- Department of Biology, University of Pennsylvania, Philadelphia, Pennsylvania, United States of America
| | - Maximilian Kordes
- Parasitology Unit, Max-Planck-Institute for Infection Biology, Berlin, Germany
| | - Johannes Friesen
- Parasitology Unit, Max-Planck-Institute for Infection Biology, Berlin, Germany
| | - Kai Matuschewski
- Parasitology Unit, Max-Planck-Institute for Infection Biology, Berlin, Germany
| | - Klaus Lingelbach
- Parasitologie, Fachbereich Biologie, Philipps-Universität, Marburg, Germany
| | - Hassan Jomaa
- Institut für Klinische Immunologie und Transfusionsmedizin, Universitätsklinikum Giessen und Marburg GmbH, Giessen, Germany
| | - Frank Seeber
- Parasitologie, Fachbereich Biologie, Philipps-Universität, Marburg, Germany
- Fachgebiet 16 Parasitologie, Robert-Koch-Institut, Berlin, Germany
- * E-mail:
| |
Collapse
|
75
|
Grimberg BT, Mehlotra RK. Expanding the Antimalarial Drug Arsenal-Now, But How? Pharmaceuticals (Basel) 2011; 4:681-712. [PMID: 21625331 PMCID: PMC3102560 DOI: 10.3390/ph4050681] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2011] [Revised: 04/09/2011] [Accepted: 04/19/2011] [Indexed: 01/24/2023] Open
Abstract
The number of available and effective antimalarial drugs is quickly dwindling. This is mainly because a number of drug resistance-associated mutations in malaria parasite genes, such as crt, mdr1, dhfr/dhps, and others, have led to widespread resistance to all known classes of antimalarial compounds. Unfortunately, malaria parasites have started to exhibit some level of resistance in Southeast Asia even to the most recently introduced class of drugs, artemisinins. While there is much need, the antimalarial drug development pipeline remains woefully thin, with little chemical diversity, and there is currently no alternative to the precious artemisinins. It is difficult to predict where the next generation of antimalarial drugs will come from; however, there are six major approaches: (i) re-optimizing the use of existing antimalarials by either replacement/rotation or combination approach; (ii) repurposing drugs that are currently used to treat other infections or diseases; (iii) chemically modifying existing antimalarial compounds; (iv) exploring natural sources; (v) large-scale screening of diverse chemical libraries; and (vi) through parasite genome-based ("targeted") discoveries. When any newly discovered effective antimalarial treatment is used by the populus, we must maintain constant vigilance for both parasite-specific and human-related factors that are likely to hamper its success. This article is neither comprehensive nor conclusive. Our purpose is to provide an overview of antimalarial drug resistance, associated parasite genetic factors (1. Introduction; 2. Emergence of artemisinin resistance in P. falciparum), and the antimalarial drug development pipeline (3. Overview of the global pipeline of antimalarial drugs), and highlight some examples of the aforementioned approaches to future antimalarial treatment. These approaches can be categorized into "short term" (4. Feasible options for now) and "long term" (5. Next generation of antimalarial treatment-Approaches and candidates). However, these two categories are interrelated, and the approaches in both should be implemented in parallel with focus on developing a successful, long-lasting antimalarial chemotherapy.
Collapse
Affiliation(s)
- Brian T. Grimberg
- Center for Global Health and Diseases, School of Medicine, Case Western Reserve University, Cleveland, OH 44106, USA; E-Mails: (B.T.G.); (R.K.M.); Tel.: +1-216-368-6328 or +1-216-368-6172, Fax: +1-216-368-4825
| | - Rajeev K. Mehlotra
- Center for Global Health and Diseases, School of Medicine, Case Western Reserve University, Cleveland, OH 44106, USA; E-Mails: (B.T.G.); (R.K.M.); Tel.: +1-216-368-6328 or +1-216-368-6172, Fax: +1-216-368-4825
| |
Collapse
|